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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>

    <script type="text/javascript">

        let number = 18;
        let person = { name: "张三", sex: "男" };
        Object.defineProperty(person, "age", {
            //age 默认值18
            // enumerable:true, //控制属性是否可以枚举，默认值是false
            // writable:true, //控制属性是否可以被修改，默认值是false
            // configurable:true //控制属性是否可以被删除，默认值是false
            get() {
                console.log("读取age属性");
                return number;
            },
            set(value) {
                console.log("修改age属性，值：", value);
                number = value;
            }
        });


    </script>

</body>

</html>